SpringBoot Application Startup Failed due to autowire JavaMailSender - version 2.0.0-snapshot - spring

Question

I m using Spring Boot 2.0.0.BUILD-SNAPSHOT.
I have a problem when autowiring JavaMailSender or JavaMailSenderImpl.
If i configure #Autowired for JavaMailSender, i m getting below error.
***************************
APPLICATION FAILED TO START
***************************
Description:
Field mailSender in com.hm.assetmanagment.service.MailService required a bean of type 'org.springframework.mail.javamail.JavaMailSenderImpl' that could not be found.
- Bean method 'mailSender' not loaded because #ConditionalOnClass did not find required class 'javax.mail.internet.MimeMessage'
Action:
Consider revisiting the conditions above or defining a bean of type 'org.springframework.mail.javamail.JavaMailSenderImpl' in your configuration.
Below are my pom.xml which has spring boot starter email.
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>com.hm.assetmanagement</groupId>
<artifactId>AssetManagementSystem</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>jar</packaging>
<name>AssetManagementSystem</name>
<description>AssetManagementSystem</description>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.0.0.BUILD-SNAPSHOT</version>
<relativePath /> <!-- lookup parent from repository -->
</parent>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
<java.version>1.8</java.version>
</properties>
<dependencies>
<!-- <dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-context-support</artifactId>
</dependency>-->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-jpa</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-rest</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-security</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-thymeleaf</artifactId>
</dependency>
<dependency>
<groupId>org.thymeleaf.extras</groupId>
<artifactId>thymeleaf-extras-springsecurity4</artifactId>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-jdbc</artifactId>
</dependency>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
</dependency>
<dependency>
<groupId>com.h2database</groupId>
<artifactId>h2</artifactId>
<scope>runtime</scope>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
<!-- <dependency>
<groupId>javax.mail</groupId>
<artifactId>mail</artifactId>
<version>1.4.7</version>
</dependency>-->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-mail</artifactId>
<!-- <exclusions>
<exclusion>
<groupId>com.sun.mail</groupId>
<artifactId>javax.mail</artifactId>
</exclusion>
</exclusions>-->
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
<repositories>
<repository>
<id>spring-snapshots</id>
<name>Spring Snapshots</name>
<url>https://repo.spring.io/snapshot</url>
<snapshots>
<enabled>true</enabled>
</snapshots>
</repository>
<repository>
<id>spring-milestones</id>
<name>Spring Milestones</name>
<url>https://repo.spring.io/milestone</url>
<snapshots>
<enabled>false</enabled>
</snapshots>
</repository>
</repositories>
<pluginRepositories>
<pluginRepository>
<id>spring-snapshots</id>
<name>Spring Snapshots</name>
<url>https://repo.spring.io/snapshot</url>
<snapshots>
<enabled>true</enabled>
</snapshots>
</pluginRepository>
<pluginRepository>
<id>spring-milestones</id>
<name>Spring Milestones</name>
<url>https://repo.spring.io/milestone</url>
<snapshots>
<enabled>false</enabled>
</snapshots>
</pluginRepository>
</pluginRepositories>
</project>
package com.hm.assetmanagment.service;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.mail.javamail.JavaMailSenderImpl;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
#RestController
public class MailService {
#Autowired
private JavaMailSenderImpl mailSender;
#RequestMapping("/assets/allocateemail/{name}/{email}/{assetid}")
private void sendAssetAllocationEmail(String name, String email, String assetid) {
/*SimpleMailMessage simpleMailMessage = new SimpleMailMessage();
simpleMailMessage.setTo(email);
simpleMailMessage.setSubject("Asset Allocation Confirmation");
simpleMailMessage.setText("Hello " + name + "," + assetid + "\n" + " - Asset allocated to you");
mailSender.send(simpleMailMessage);*/
}
}
I tried by adding javax.mail jar/spring context support manually in dependency but it didnt work.
application.properties:
spring.mail.host=smtp.gmail.com
spring.mail.username=xxx#gmail.com
spring.mail.password=xxx
spring.mail.port=587
spring.h2.console.enabled=true
spring.h2.console.path=/h2-console
spring.thymeleaf.cache=false
debug=true
spring.jpa.hibernate.naming.physical-strategy=org.hibernate.boot.model.naming.PhysicalNamingStrategyStandardImpl
Main Class:
package com.hm.assetmanagment;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.data.jpa.repository.config.EnableJpaRepositories;
#EnableJpaRepositories
#SpringBootApplication
public class AssetManagementSystemApplication {
public static void main(String[] args) {
SpringApplication.run(AssetManagementSystemApplication.class, "--debug");
//SpringApplication.run(AssetManagementSystemApplication.class, args);
}
}
Please guide.
Update from me Nov22:
If i create new class and enable auto configuration on that class, JavaMailSender and JavaMailSenderImpl are autowired properly and spring boot application starts successfully. Already i have enableautoconfiguration in application.class as well. Is it fine to have two classes configured with enableautoconfiguration? Is there any other way to autowire JavaMailSender?
#EnableAutoConfiguration
public class MailConfig {
#Autowired
private JavaMailSenderImpl mailSender;
}

Answer 1

well it looks like you have not configured the Mailer at all , thus Spring cannot find the bean in order to wire it. If it was a dependency issue , then you would get a ClassNotFoundException or NoClassDefException , which is not your case.
Anyway try to configure your Mailer like this :
#Configuration
public class MailConfig {
#Bean
public JavaMailSender javaMailService() {
JavaMailSenderImpl javaMailSender = new JavaMailSenderImpl();
javaMailSender.setHost("myHost");
javaMailSender.setPort(25);
javaMailSender.setJavaMailProperties(getMailProperties());
return javaMailSender;
}
private Properties getMailProperties() {
Properties properties = new Properties();
properties.setProperty("mail.transport.protocol", "smtp");
properties.setProperty("mail.smtp.auth", "false");
properties.setProperty("mail.smtp.starttls.enable", "false");
properties.setProperty("mail.debug", "false");
return properties;
}
}
Original answer here

Answer 2

By seeing your code , you need to add below properties to work
Sample app.yml file
spring
mail:
default-encoding: UTF-8
host: localhost
port: 8025
protocol: smtp
test-connection: false
properties.mail.smtp:
starttls.enable: true
Here is the reference
https://docs.spring.io/spring-boot/docs/2.1.x/reference/html/boot-features-email.html
make sure you are reading app properties

Answer 3

Change
#Autowired
private JavaMailSenderImpl mailSender;
to
#Autowired
private JavaMailSender mailSender;
The reason for this is, that by default Spring creates JDK proxies, if a bean class implements an interface. The JDK proxy implements the same interfaces as the bean class, but does not extend the class.